Social value puts a number on what an activity is worth to people's lives, not just what it costs. Social Value UK defines it as the relative importance people place on the changes they experience. The UK made this a legal requirement for public bodies in 2012.
museum, gallery, concert, etc.
self-reported life satisfaction survey
what income rise gives the same wellbeing lift
HM Treasury endorsed method
Ixia, England's public art think tank, assesses public art against four value categories: artistic, social, environmental, and economic. Social value is one part of that picture, not the whole score.